import { fail, handleOptions, json } from "../_shared/http.ts";
import { requireUser } from "../_shared/supabase.ts";

Deno.serve(async (req) => {
  const preflight = handleOptions(req);
  if (preflight) return preflight;

  if (req.method !== "POST") return fail("Method not allowed", 405);

  const { client, user, error: userError } = await requireUser(req);
  if (!user) return fail(userError ?? "Unauthorized", 401);

  let body: { channel_id?: string; schedule_id?: string; trip_number?: string };
  try {
    body = await req.json();
  } catch {
    return fail("Invalid JSON body");
  }

  const channelId = (body.channel_id ?? "").trim();
  const scheduleId = (body.schedule_id ?? "").trim();
  const tripNumber = (body.trip_number ?? "").trim();

  if (!channelId) return fail("channel_id is required");
  if (!scheduleId) return fail("schedule_id is required");
  if (!tripNumber) return fail("trip_number is required");

  const { data: schedule, error: scheduleError } = await client
    .from("operations_schedules")
    .select("id, channel_id")
    .eq("id", scheduleId)
    .eq("channel_id", channelId)
    .maybeSingle();

  if (scheduleError) return fail(scheduleError.message, 400);
  if (!schedule) return fail("forbidden", 403);

  const { data: tripRow, error: tripError } = await client
    .from("operations_trips")
    .select("id, trip_number, duty_number, bus_work_number, direction, sort_order")
    .eq("schedule_id", scheduleId)
    .eq("trip_number", tripNumber)
    .maybeSingle();

  if (tripError) return fail(tripError.message, 500);
  if (!tripRow) return json({ trip: null, stops: [] });

  const trip = tripRow as { id: string };

  const { data: stopRows, error: stopError } = await client
    .from("operations_trip_stops")
    .select("id, trip_id, stop_sequence, stop_name, scheduled_time")
    .eq("trip_id", trip.id)
    .order("stop_sequence", { ascending: true });

  if (stopError) return fail(stopError.message, 500);

  return json({ trip: tripRow, stops: stopRows ?? [] });
});